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| All Patents in class 73/840 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,533,281 | Apr. 14, 1925 | H.E. Tautz | Testing machine | ||
| 2,727,386 | Dec. 20, 1955 | P.H. Miller | Paper Testing Machine | testing machines | |
| 2,865,199 | Dec. 23, 1958 | P.H. Miller | Testing Machine for Sheet Material | testing machines | |